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Old 12-16-2005, 01:35 PM
Registered User
Join Date: Jul 2005
Location: Dayton, VA
Posts: 155
My sunroof had a stripped nylon gear in the slip clutch assembly. I think the previous owner tightened it up quite a bit to keep it from slipping (the purpose of the thing) and it didn't last long. The motor was good.

The dealer couldn't sell me the gear, and wanted hundreds for a new motor. I found a 126 motor, which was somehow backwards from the one I had, removed the nylon gear, rebuilt what I had, and life is good. About a $25 repair.


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Old 12-16-2005, 03:35 PM
rg2098's Avatar
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Join Date: Jun 2004
Location: Rochester Hills, MI
Posts: 2,415
I'm getting some bearing noise out of my P/S pump in the cold. The fluid is a nice clean green and its not that loud so I'm leaving it for now.
Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section
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Old 12-16-2005, 07:11 PM
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Join Date: Jun 2005
Posts: 568
I've never had a sunroof that was not manual. I like the manual and have no experience with a power one.

I know of a w113 with 675,000 miles that has never had a problem with the power steering pump. They are solid but there is a little preventive maintenance for some of them.
1967 230SL, manual
1959 180D, manual
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Old 12-17-2005, 12:07 AM
JamesDean's Avatar
Electrical Engineer
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
my power sunroof opens/closes decently in this cold weather, 20F, at highway speeds (70mph)..
Cruise Control not working? Send me PM or email ( I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)

82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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Old 12-17-2005, 12:10 AM
Tirebiter's Avatar
Senior Member
Join Date: Dec 2003
Location: Southern California & Hawaii
Posts: 690
Originally Posted by autozen
Been turnin MB diesel engines over with the PS pump nut for over 20 years to adjust valves. Have done it on hundreds of cars without a problem. I'll bet someone did that once and coincidently the pump started leaking. That's how wive's tales get started.
I guess I should qualify my remark about the P/S pump nut.

I too turn the engine over with that nut when I adjust valves but I also remove the injectors first so I have no compression to fight. I got used to pulling and checking the injectors and recording a compression test at the time of a valve adjustment. Every shaft that was in our shop for repair was due to the owner honking down on it while on a compression stroke. The lucky ones only rounded the nut by using cheapo tools.
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Old 12-17-2005, 01:59 AM
Posts: n/a
27mm socket...1/2 drive ratchet or breaker bar...golden

Every time I think the 300SD has low compression...I usually have to do some service and turn the engine over by hand like that...reminds me that its in better shape than I thought
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Old 12-17-2005, 04:13 AM
John Holmes III
Posts: n/a
Originally Posted by Carrameow
Why do Mercedes W123 sunroofs and Power steering Pumps NEVER Fail? Even on the legendary Volvo 240's and SAAB 900's the sunroof's were a pain the alphabet. Also their, power steering pumps got you to 150 K only. There is something incredible about the W123 sunroof,and Power steering pump because I have never ever seen a post on these two parts
I would agree. Except....the day I bought my latest 123, I was driving home and opened the sunroof. Once I got home it wouldn't close because the clutch on the electric motor was loose. I closed it up and have been afraid to use it since. Nothing is more annoying than BMW power window switches. Nothing like rolling your windows down because the a/c comp. failed on your Broke More than it Works and then finding out that two windows won't roll up when it starts raining on the interstate. Thanks BMW, I will never buy another one.

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